Don't forget, it's not all about the frame. As with just about all these little trailers, (and I can't think of one stock travel trailer that this doesn't apply to,) you have to consider the facts that you also have a marginally sized suspension,
axle, and probably also undersized/load rated wheels/tires as well. If you aren't planning to upsize, upgrade, and "beef up" this whole thing from the ground up to the bottom of the trailer, I still say it's a bad idea.